hudson sang "let's stay together" mrs. obama chose jason wu yet again to design her inaugural gown. the obama's appeared at the inaugural ball where 30,000 people were expected to attend. this inaugural ball follows on a tradition started in 2009 to open up these once exclusive events to everyday americans, a ticket costs as little as $60 and got people access to an amazing line-up of entertainment. ♪ obama's on fire >> reporter: alicia keys tweaked a rendition of her popular song. ♪ how are you this evening >> reporter: brad paisley brought the country. ♪ music is a world within itself, it's a language we all understand ♪ >> reporter: and stevie wonder brought down the house, while jamie foxx serenaded the bidens. ♪ i can't stop loving you >> reporter: there was also a special performance by mexico's hottest rock band. i'm here with mena, winners of multiple grammys and multiple latin grammys. alex you have supported president obama in his re-election this year, so many hispanic-americans came out for him. why d